Pad-holder.



W. A. REED; PAD HOLDER.

APPLICATION FILED NOV-22,1912.

Patented June 22, 1915.

Min/5555:

WILLIAM A. REED, OF CHELSEA,

MASSACHUSETTS, ASSIGNOR '10 uni'rnio sires MACHINERY COMPANY, OFPATERSON, NEW JERSEY, A CORPORATION OF NEW JERSEY.

PAID-HOLDER.

Specification of Letters Patent.

Patented June 22, list-5..

Application filed November 22, 1912. Serial No. 732,

To all whom it may concern:

Be it known that I, WILLIAM A.-REED, a citizen of the United States,residing at Chelsea, in the county of Suffolk and State ofMassachusetts, have invented certain Improvements in Pad-Holders, ofwhich the following description, in connection with the accompanyingdrawings, is a specification, like reference characters on the drawingsindicating like parts in the several figures.

This invention relates to machines for operating upon the bottoms ofboots and shoes and is illustrated in connection with apad holder for abufling machine. In machines of this class it is customary to provide atthe end of a rotatable spindle a pad holder comprising a yieldingsupport for the abrasive pad or cover and clamping means to secure saidpad in position.

An object of the invention is to providea pad holder about which the padis yieldingly drawn at all times and from which the pad may be readilydetached.

To this end one feature of the invention comprises a bufling pad, aholder, a member movable with respect to said holder and adapted toengage said pad, a spring acting normally to move said member in a direction to draw said pad about said holder, and means for compressing saidspring. This and other features of the invention including certaindetails of construction and combinations of parts will be described inconnection with an illustrative device and pointed out in the appendedclaims.

Referring now to the accompanying drawings, Figure 1 is a perspective ofa pad holder in which the present invention is embodied, showing athree-strap pad attached thereto, a portion of one of said straps havingbeen broken away; Fig. 2 is a detail perspective of a portion of theholder shown in Fig. 1, with part of the device in cross section; Fig. 3is a perspective of a modified form of pad holder showing a three-strappad attached thereto; Fig. 4 is a view, half in elevation and halfsection, of the holder illustrated in Fig. 3; and Fig. 5 is a plan of athree-strap pad ordinarily used in buffing machines which operate uponboots and shoes, said pad being made of sandpaper, emery paper, or anyother suitable abrading material.

Referring now to Figs. 1 and 2, the numeral 1 indicates the stem of abufling pad holder constructed to be attached to the lower portion oftheusual rotatable spindle provided in bufiing machines of this type.The holder comprises a circular base 3 which is preferably integral withthe stem 1 and has secured upon its outer face a covering of yieldingmaterial such as felt 20 which serves as a backing for the abrasive pad.Upon the upper'face of the base 3 are formed a plurality of radiallydisposed shdeways 5, preferably three in number, if a three-strap pad isto be used. Each slideway 5 has formed therein a recess to receive aspring 10, ahd blocks 6 are provided to sllde in the slideways 5 asshown. These sliding blocks 6 may be provided with prongs? at theirouter ends to engage the straps ot the bufling pad and with a dependlngportion or shoulder 8 at their inner ends to engage the springs 10 whichexert a forcetending to hold the blocks 6 in their inner operatlveposition as shown in Fig. 2. A thumb nut 12 is rotatably mounted on thestem 1 and has formed upon its lower portion three cams 15 one for eachblock 6, each cam being adapted to engage an adacent shoulder 8 upon oneof the blocks. A partial rotation of the thumb nut 12 in a counterclockwise direction, as viewed in Fig. 2, thus causes the cams .15 toact upon the shoulders 8 and thereby to move the blocks 6 outwardly inopposition to the force of the springs 10. The sliding blocks 6 are heldfrom vertical movement by a flange 13 on the thumb nut 12; and the thumbnut in turn is prevented from rising by a collar 17 which.is adjustablyfastened to the stem 1 by a set screw.

The device is manipulated as follows With the parts in position as shownin Figs. 1 and 2, in which the pad is tightly drawn about the padholder, the thumb nut 12 is given approximately a quarter turn therebybringing the cams 15 into engagement with the adjacent shoulders 8 oftheir respective blocks and thus moving the blocks outwardly and holdingthem intheir outward stretch the pad 21 over the backing 20. It shouldbe particularly noted that when the nut 12 has been given a quarter turnor thereabout from the position shown in Fi s.

1 and 2, the sliding blocks 6 will be-he d securely in their outwardpositions until the nut is rotated in the opposite direction.

, a In the embodiment of the invention shown in Figs. 3 and 4, the stem100, holder 300 and backing 200 are similar to those described inconnection with Figs. 1 and 2. A thumb nut 26 is arranged loosely uponthe stem 100 and has upon its upper face two cams 27 arranged to engagea collar 25 which is secured to the stem 100 by a set screw. The collar25 has recesses 28 which receive the cams 27 when the parts are in theposition shown in Fig. 3. The thumb nut 26 bears with its lower faceagainst a clamping device, which comprises a lower clamping member 32having a circular base or flange 33, and an upper clampmg member or ring35 which is operated by a nut 30 threaded upon the hub of the member 32.A recess in the interior of the lower clamping member 32 is provided fora spring 37 which bears at one end against the upper wall of said recessand at the other end---against the base 300 of the holder, thus tendingto maintain the member 32 and consequently the entire clamping device inextreme upward position with re spect to the base 300. The ring 35 isloosely held by the nut 30, said ring having a hub provided with aprojecting annular rib 36 which fits in a corresponding-groove in saidnut. The lower member 32 of the clamping device is held to rotate withthe holder 300 but may move vertically with respect thereto whenpermitted by. the position of the nut 26. To this end pins 39 are fixedin the base 300 of the holder and extend into sockets in the member 32.It is desirable to maintain the clamping ring 35 in a fixed angularposition with respect to the flange 33 of the lower clamping memher, andfor this purpose pins 40 carried by the flange 33 extend into holes inthe c amping ring as best shown in Fig. 3. In order to secure a firmerhold upon the straps of the pad than might be obtained by merelyclamping said straps between the ring 35 and the flange 33, pins orprongs 42 may be formed or mounted upon the flange 33, said pinsextending into sockets in the clamping ring 35 when said ring is movedinto clamping position.

The manipulation of this form of the invention is as follows :The partsof the device beingin the position shown in Fig. 3 with a pad in place,the cams 27 in the recesses 28 of the collar 25, and the spring 37acting to hold the clamping device in uppermost position, the nut 26 isrotated so that the cams 27 will bear against the lower face 29 of thecollar 25. This movement will force the clamping device downwardlyagainst the pressure of the spring 37 and loosen the tension upon thestraps 22. Th nut 30 is then rotated to lift the clampin ring 35 fromengagement with the flange 33 and to clear the pins 42 from the ring 35.The device will then be in the position shown in Fig 4 in which positionthe old pad may1 be removed and replaced by a new one. T e nut 30 willthen be rotated in order to clamp the straps of the pad between the ring35 and the flange 33 after which the nut 26 will be rotated to permitthe cams 27 to be. received in the recesses 28, whereupon the spring 37will lift the whole clamping device and draw the pad yieldinglv aboutthe backing.

aving thus described my invention, what I claim as new and desire tosecure by Letters Patent of the United States is 1. In a device of theclass described a pad, a holder, movable means for engaging said pad atits edges, resilient means located between said movable means and saidholder arranged to exert a continuous tension upon said pad through saidmovable means to draw said pad smoothly about said holder, and means forcompressing said resilient means to relieve said tension.

2. In adevice of the class described a pad having perforated tabs, aholder, movable means provided with prongs for engaging saidperforations, resilient means located between said movable means andsaid holder arranged to exert a continuous pull on the edges of said padto draw it smoothly about said holder, and means for compressing saidresilient means to relieve said pull.

3. In a device of the class described, a pad holder, a bufling pad, aplurality of movable clamping members on said holder arranged to securesaid pad to said holder, and yielding means to move said clampingmembers into operative position to draw said pad about said holder.

4. In a device of the class described, a pad holder, a buffing pad, aplurality of sliding blocks upon said holder having provision forengagement with said pad, yielding means for actuating said blocks inone direction, and means to move said blocks simultaneously in theopposite direction.

5. In a device of the class described, a pad holder, a bufling pad, aplurality of movable clamping members on said holder to secure said padto said holder, yielding means to move said clamping members in onedirection, and a thumb nut on said holder having cams formed thereon tomove said clamping members in the opposite direction.

6. In a device of the class described, a pad holder, a bufling pad,slideways on the upper face of the holder, sliding blocks in saidslideways, prongs on each block adapted to I engage the strap of aboiling pad, springs to holder, a three-strap pad, clamping members uponsaid holder arranged to engage the straps of said pad, yielding means toactuate said clamping members independently whereby a yielding tensionis put upon each strap, and means simultaneously to relieve said strapsfrom said tension 8. In a device of the class described, a pad holder, aplurality of movable clamping members mounted on said holder and ar- 15ranged to engage said pad, yielding means for moving said membersinwardly to draw said pad about said holder, and cams for moving saidmembers outwardly, said cams being constructed and arranged to hold saidan members in their outward position.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

WILLIAM A. REED.

Witnesses:

CHESTER E. ROGERS, RUTH Ii). "WARD.

